US20090219295A1 - Display System and Method for Reducing Power Consumption of Same - Google Patents

Display System and Method for Reducing Power Consumption of Same Download PDF

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Publication number
US20090219295A1
US20090219295A1 US12/323,817 US32381708A US2009219295A1 US 20090219295 A1 US20090219295 A1 US 20090219295A1 US 32381708 A US32381708 A US 32381708A US 2009219295 A1 US2009219295 A1 US 2009219295A1
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US
United States
Prior art keywords
frame data
received frame
data
display
currently
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Abandoned
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US12/323,817
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English (en)
Inventor
Jozef Hubert Reijnaerts
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Innolux Corp
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TPO Displays Corp
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Publication date
Application filed by TPO Displays Corp filed Critical TPO Displays Corp
Priority to US12/323,817 priority Critical patent/US20090219295A1/en
Assigned to TPO DISPLAYS CORP. reassignment TPO DISPLAYS CORP. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: REIJNAERTS, JOZEF HUBERT
Publication of US20090219295A1 publication Critical patent/US20090219295A1/en
Assigned to CHIMEI INNOLUX CORPORATION reassignment CHIMEI INNOLUX CORPORATION MERGER (SEE DOCUMENT FOR DETAILS). Assignors: TPO DISPLAYS CORP.
Abandoned legal-status Critical Current

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/003—Details of a display terminal, the details relating to the control arrangement of the display terminal and to the interfaces thereto
    • G09G5/006—Details of the interface to the display terminal
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/14—Digital output to display device ; Cooperation and interconnection of the display device with other functional units
    • G06F3/1415—Digital output to display device ; Cooperation and interconnection of the display device with other functional units with means for detecting differences between the image stored in the host and the images displayed on the displays
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/04—Partial updating of the display screen
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/10—Special adaptations of display systems for operation with variable images
    • G09G2320/103—Detection of image changes, e.g. determination of an index representative of the image change
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2340/00—Aspects of display data processing
    • G09G2340/04—Changes in size, position or resolution of an image
    • G09G2340/0407—Resolution change, inclusive of the use of different resolutions for different screen areas
    • G09G2340/0435—Change or adaptation of the frame rate of the video stream
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/18—Use of a frame buffer in a display terminal, inclusive of the display panel

Definitions

  • the present invention relates to a method for reducing power consumption of a display system, and more particularly to a method performing new-image recognition for reducing power consumption of a display system.
  • the present invention also relates to a display system exhibiting reduced power consumption.
  • a driver IC drives the panel to reveal inputted or updated image data.
  • a display device 12 is optionally built with a display memory 121 , e.g. a RAM (random accessed memory), for storing a pixel data array representing an image received from a host 11 via a driver IC 122 .
  • a display memory 121 e.g. a RAM (random accessed memory)
  • the display data are continuously sent to a display panel 123 without a display memory at a high refresh rate, as illustrated in FIG. 1A .
  • a display memory 121 is built in the driver IC 122 , as illustrated in FIG.
  • the image data are written into the memory 121 and displayed subsequently, for example, in a refresh-burst manner.
  • the refresh rate is defined inside the driver IC 122 , and the internal refresh rate of the memory 121 is generally high to avoid delay in or slow update of a new image.
  • all circuits in the display device 12 should remain active and run at a high frequency, and thus high power consumption is incurred.
  • a flash memory used for AMOLED
  • consumes a relatively large power at a high refresh-rate about 40 mW estimated at 65 Hz refresh-rate). Since a periodically refresh process is executed but the displayed image is not always changing, it is likely to redundantly rewrite information without any modification to the displayed image, and thus waste power for no reason.
  • the present invention provides a display system exhibiting reduced power consumption and a method for reducing power consumption of a display system by executing refresh only when a new image is recognized.
  • the present invention relates to a method for reducing power consumption of a display.
  • the method includes steps of: discriminating whether a currently received frame data is different from a currently displayed frame data or not; suspending data refresh if the currently received frame data is not different from the currently displayed frame data; and executing data refresh if the currently received frame data is different from the currently displayed frame data.
  • the discriminating step includes: calculating a characteristic parameter of the currently received frame data; comparing the characteristic parameter of the currently received frame data with the characteristic parameter of the currently displayed frame data; determining that the currently received frame data is not different from the currently displayed frame data when the characteristic parameters match each other; and determining that the currently received frame data is different from the currently displayed frame data when the characteristic parameters do not match.
  • the discriminating step is executed by a host outputting the currently received frame data to the display, and the host issues a new-image signal to have the display execute the data refresh when the currently received frame data is different from the currently displayed frame data which is previously outputted to the display by the host.
  • the discriminating step includes: detecting memory-write access of a display memory disposed in the display for storing frame data; determining that the currently received frame data is not different from the currently displayed frame data if there is no new data written into the display memory; and determining that the currently received frame data is different from the currently displayed frame data when there is new data written into the display memory.
  • the present invention also provides a display system, which includes: a display panel; a host for providing a frame data to be displayed by the display panel; and a driver IC coupled between the host and the display panel for receiving the frame data and driving the display panel to show the frame data.
  • the driver IC determines whether a newly received frame data is new, suspends data refresh if the newly received frame data is not new, and executes data refresh if the newly received frame data is new.
  • FIG. 1A is a functional block diagram illustrating a conventional display system without a display memory
  • FIG. 1B is a functional block diagram illustrating another conventional display system with a display memory
  • FIG. 2A is a functional block diagram illustrating a display system without a display memory according to an embodiment of the present invention
  • FIG. 2B is a flowchart summarizing a method for reducing power consumption of the display of FIG. 2A according to an embodiment of the present invention
  • FIG. 3A is a functional block diagram illustrating a display system with a display memory according to an embodiment of the present invention.
  • FIG. 3B is a flowchart summarizing a method for reducing power consumption of the display of FIG. 3A according to an embodiment of the present invention.
  • a new-image-recognition operation is performed according to the present invention, and refresh is executed only when a new (different) image is recognized.
  • embodiments of power-saving methods for use in a display system without a display memory and a display system with a display memory according to the present invention are illustrated with reference to FIG. 2A and FIG. 3A , respectively.
  • a display system principally includes a host 21 , a driver circuit 22 and a display panel 23 .
  • the driver IC 22 drives the display panel 23 to reveal image data.
  • a newly received image signal is checked to see if it is a new image, i.e. if it is different from the image being displayed by the panel 23 to a certain extent. Once a new image is recognized, data refresh of the display panel is normally executed. Otherwise, the coming data are blocked and keep last non-blocked frame on the panel until next new image is processed.
  • the display system does not include a display memory, and data are intermittently blocked by way of gating.
  • “Gating” is a process of virtually disconnecting non-participating devices during a certain period. By temporarily switching off the unused devices, power-saving can be achieved. Likewise, by gating off logic and clock sources to reduce the substantial refresh rate, power consumption resulting from a high refresh rate of images can be reduced. For example, gating is effective for reducing power consumption of an AMOLED or TFT-AMLCD panel, particularly an AMOLED panel due to the DC-nature of the LED and low leak panel-design as well as the large power consumption thereof at a high refresh rate. Between the refresh-bursts a significant part of the panel-driver and flash memory can be switched off so as to reduce power consumption.
  • power saving can be achieved by gating without sacrificing image quality. This method is also useful in UI mode or video mode with a lot of still frames in it.
  • checksum is a way to protect the integrity of a data and can be variously implemented. Basically, one or more specified operations of the data are performed to obtain a checksum parameter, which is properly stored. Afterwards, one may perform the same operation(s) and compare the operated result with the stored value to see if there is any error occurring. The sophisticated the checksum, the precise the error-check effect.
  • a CRC (cyclic redundancy check) code is an example of such a checksum.
  • a CRC code is an error-detecting code which is obtained by a long division computation of a value representing a transmitted data block and equals to the remainder of the division computation. Therefore, the checksum parameter of a data, which is obtained by CRC or any other suitable algorithm, is substantially characteristic. By comparing respective checksum parameters, whether image changes or not can be detected. It is preferred the checksum is long enough so as to precisely detect the change of images. Nevertheless, less sophisticated checksum can be used if less power consumption is desired rather than better image quality.
  • the determination of a new image can be executed by the host 21 , and the host 21 sends a new-image signal along with the image signal to the driver circuit 22 when a new image is recognized.
  • FIG. 2B is a flowchart briefly summarizing the above-mentioned gating process.
  • a checksum parameter (ID 2 ) of the newly received frame data (F 2 ) is calculated by the driver circuit 22 and stored in a register 221 of the driver circuit 22 (Step S 11 ).
  • the checksum parameter (ID 2 ) is then compared with a checksum parameter (ID 1 ) of last non-blocked frame data (F 1 ) currently displayed on the panel 23 , which is stored in a register 222 of the driver circuit 22 (Step S 12 ).
  • ID 2 is equal to ID 1 , it is determined that the newly received image (F 2 ) is not new and thus blocked from being displayed on the panel 23 (Step S 13 ).
  • the checksum parameters (ID 1 and ID 2 ) are not equal, check if the currently received frame data (F 2 ) is in an inherently blocked state, e.g. preceding frame (F 1 ′) has been blocked (blocked state) or passed (non-blocked state) (Step S 14 ). If the currently received frame data (F 2 ) is in a non-blocked state, pass the frame data (F 2 ) to be displayed by the panel 23 (Step S 15 ).
  • Step S 16 transit the state to a non-blocked state and refresh the currently displayed frame data (F 1 ) with frame data (F 3 ) coming next to the compared frame data (F 2 ) (Step S 16 ). In this case, only one frame will be lost. In spite new-image recognition is the key point for determining whether the data refresh is to be executed, the panel 23 had better not wait too long to refresh frame data displayed thereon. Therefore, even if the checksum parameters ID 1 and ID 2 are equal in the discriminating step S 12 , data refresh is still executed after a predetermined period of non-refresh time is due by refreshing the currently displayed frame data (F 1 ) with frame data (F 4 ) last received while time is up (Step S 17 and S 18 ). Meanwhile, the checksum parameter (ID 1 ) to be compared with is updated with those (ID 2 , ID 3 or ID 4 ) of the newly displayed frame data (F 2 , F 3 or F 4 ) (Step S 19 ).
  • checksum such as CRC is used as a parameter to determine whether the image changes or not.
  • other characteristic features of an image frame e.g. luminance, can also be used for new image recognition.
  • FIG. 3A in which another embodiment of display system is illustrated.
  • the display system includes a display memory 223 inside the driver circuit 22 .
  • the driver circuit 22 executes immediate fast burst-refresh to refresh frame data displayed on the panel 23 .
  • the new-image recognition is done by detecting RAM write access of the display memory 223 . If RAM write access to the display memory 223 is executed, data refresh cycles are immediately executed in succession within a given period. This method is summarized in the flowchart of FIG. 3B .
  • the display system can be a mobile phone, a digital camera, a personal digital assistant (PDA), a laptop computer, a desktop computer, a television set, a car display, a navigator with global positioning system (GPS), an aviation display, a digital photo frame, a portable DVD player, or any other suitable electronic apparatus with a display.
  • PDA personal digital assistant
  • GPS global positioning system

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Engineering & Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Controls And Circuits For Display Device (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Electroluminescent Light Sources (AREA)
  • Control Of El Displays (AREA)
  • Liquid Crystal (AREA)
US12/323,817 2007-11-26 2008-11-26 Display System and Method for Reducing Power Consumption of Same Abandoned US20090219295A1 (en)

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US20110115839A1 (en) * 2009-11-13 2011-05-19 Semiconductor Energy Laboratory Co., Ltd. Display device and electronic device including the same
US20110164027A1 (en) * 2010-01-06 2011-07-07 Qualcomm Mems Technologies, Inc. Method of detecting change in display data
US20110175895A1 (en) * 2010-01-20 2011-07-21 Semiconductor Energy Laboratory Co., Ltd. Method for driving display device and liquid crystal display device
US20130201124A1 (en) * 2012-02-07 2013-08-08 Samsung Electronics Co., Ltd. System on chip, operation method of the same, and mobile device including the same
WO2013157859A1 (en) * 2012-04-20 2013-10-24 Samsung Electronics Co., Ltd. Method and apparatus for display power reduction using extended nal unit header information
US8749541B2 (en) * 2012-04-05 2014-06-10 Apple Inc. Decreasing power consumption in display devices
EP2785052A1 (en) * 2011-11-25 2014-10-01 Panasonic Corporation Baseband video data transmission device and receiving device, and transceiver system
WO2014209491A1 (en) * 2013-06-24 2014-12-31 Apple Inc. Organic light-emitting diode display with burn-in reduction capabilities
EP2902996A4 (en) * 2012-09-26 2015-09-16 Sharp Kk DISPLAY DEVICE AND METHOD OF CONTROLLING THE SAME
EP2894625A4 (en) * 2012-09-07 2016-06-08 Sharp Kk IMAGE DATA OUTPUT CONTROL DEVICE, DISPLAY DEVICE, PROGRAM AND RECORDING MEDIUM THEREFOR
US10061172B2 (en) 2009-10-16 2018-08-28 Semiconductor Energy Laboratory Co., Ltd. Liquid crystal display device and electronic apparatus having the same
US20180322843A1 (en) * 2015-12-02 2018-11-08 Sharp Kabushiki Kaisha Display device and driving method thereof
US10269156B2 (en) 2015-06-05 2019-04-23 Manufacturing Resources International, Inc. System and method for blending order confirmation over menu board background
US10313037B2 (en) 2016-05-31 2019-06-04 Manufacturing Resources International, Inc. Electronic display remote image verification system and method
US10319408B2 (en) 2015-03-30 2019-06-11 Manufacturing Resources International, Inc. Monolithic display with separately controllable sections
US10319271B2 (en) * 2016-03-22 2019-06-11 Manufacturing Resources International, Inc. Cyclic redundancy check for electronic displays
US10347197B2 (en) 2009-12-28 2019-07-09 Semiconductor Energy Laboratory Co., Ltd. Liquid crystal display device and electronic device
CN110192239A (zh) * 2017-01-24 2019-08-30 株式会社半导体能源研究所 显示装置及电子设备
US10510304B2 (en) 2016-08-10 2019-12-17 Manufacturing Resources International, Inc. Dynamic dimming LED backlight for LCD array
US10559249B2 (en) 2015-12-28 2020-02-11 Semiconductor Energy Laboratory Co., Ltd. Device, television system, and electronic device
US10922736B2 (en) 2015-05-15 2021-02-16 Manufacturing Resources International, Inc. Smart electronic display for restaurants
US11243593B2 (en) 2010-02-03 2022-02-08 Stmicroelectronics, Inc. Packet-based digital display interface signal mapping to micro serial interface
CN115394261A (zh) * 2022-08-25 2022-11-25 深圳市优奕视界有限公司 一种像素刷新存储方法、装置、电子设备及存储介质
US11895362B2 (en) 2021-10-29 2024-02-06 Manufacturing Resources International, Inc. Proof of play for images displayed at electronic displays

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US10310348B2 (en) 2009-10-16 2019-06-04 Semiconductor Energy Laboratory Co., Ltd. Liquid crystal display device and electronic apparatus having the same
US10061172B2 (en) 2009-10-16 2018-08-28 Semiconductor Energy Laboratory Co., Ltd. Liquid crystal display device and electronic apparatus having the same
US9520411B2 (en) 2009-11-13 2016-12-13 Semiconductor Energy Laboratory Co., Ltd. Display device and electronic device including the same
US20110115839A1 (en) * 2009-11-13 2011-05-19 Semiconductor Energy Laboratory Co., Ltd. Display device and electronic device including the same
US10332912B2 (en) 2009-11-13 2019-06-25 Semiconductor Energy Laboratory Co., Ltd. Display device and electronic device including the same
US10861401B2 (en) 2009-12-28 2020-12-08 Semiconductor Energy Laboratory Co., Ltd. Liquid crystal display device and electronic device configured to operate at two different refresh ratees
US10347197B2 (en) 2009-12-28 2019-07-09 Semiconductor Energy Laboratory Co., Ltd. Liquid crystal display device and electronic device
WO2011084533A1 (en) * 2010-01-06 2011-07-14 Qualcomm Mems Technologies, Inc. Method of detecting change in display data
US20110164027A1 (en) * 2010-01-06 2011-07-07 Qualcomm Mems Technologies, Inc. Method of detecting change in display data
US8817009B2 (en) 2010-01-20 2014-08-26 Semiconductor Energy Laboratory Co., Ltd. Method for driving display device and liquid crystal display device
US20110175895A1 (en) * 2010-01-20 2011-07-21 Semiconductor Energy Laboratory Co., Ltd. Method for driving display device and liquid crystal display device
US11675406B2 (en) 2010-02-03 2023-06-13 Stmicroelectronics, Inc. Packet-based digital display interface
US11243593B2 (en) 2010-02-03 2022-02-08 Stmicroelectronics, Inc. Packet-based digital display interface signal mapping to micro serial interface
EP2785052A1 (en) * 2011-11-25 2014-10-01 Panasonic Corporation Baseband video data transmission device and receiving device, and transceiver system
EP2785052A4 (en) * 2011-11-25 2015-03-11 Panasonic Corp TRANSMISSION DEVICE AND RECEIVER FOR BASEBAND VIDEO DATA AND TRANSMITTER RECEIVER SYSTEM
US9916814B2 (en) * 2012-02-07 2018-03-13 Samsung Electronics Co., Ltd. System on chip, operation method of the same, and mobile device including the same
US20130201124A1 (en) * 2012-02-07 2013-08-08 Samsung Electronics Co., Ltd. System on chip, operation method of the same, and mobile device including the same
US8749541B2 (en) * 2012-04-05 2014-06-10 Apple Inc. Decreasing power consumption in display devices
WO2013157859A1 (en) * 2012-04-20 2013-10-24 Samsung Electronics Co., Ltd. Method and apparatus for display power reduction using extended nal unit header information
EP2894625A4 (en) * 2012-09-07 2016-06-08 Sharp Kk IMAGE DATA OUTPUT CONTROL DEVICE, DISPLAY DEVICE, PROGRAM AND RECORDING MEDIUM THEREFOR
EP3764347A1 (en) * 2012-09-07 2021-01-13 Sharp Kabushiki Kaisha Image data output control device, display device, program, and recording medium therefor
EP2902996A4 (en) * 2012-09-26 2015-09-16 Sharp Kk DISPLAY DEVICE AND METHOD OF CONTROLLING THE SAME
US9524676B2 (en) 2013-06-24 2016-12-20 Apple Inc. Organic light-emitting diode display with burn-in reduction capabilities
WO2014209491A1 (en) * 2013-06-24 2014-12-31 Apple Inc. Organic light-emitting diode display with burn-in reduction capabilities
US10319408B2 (en) 2015-03-30 2019-06-11 Manufacturing Resources International, Inc. Monolithic display with separately controllable sections
US10922736B2 (en) 2015-05-15 2021-02-16 Manufacturing Resources International, Inc. Smart electronic display for restaurants
US10269156B2 (en) 2015-06-05 2019-04-23 Manufacturing Resources International, Inc. System and method for blending order confirmation over menu board background
US10467610B2 (en) 2015-06-05 2019-11-05 Manufacturing Resources International, Inc. System and method for a redundant multi-panel electronic display
US10497330B2 (en) * 2015-12-02 2019-12-03 Sharp Kabushiki Kaisha Display device that performs pause driving
US20180322843A1 (en) * 2015-12-02 2018-11-08 Sharp Kabushiki Kaisha Display device and driving method thereof
US10559249B2 (en) 2015-12-28 2020-02-11 Semiconductor Energy Laboratory Co., Ltd. Device, television system, and electronic device
US10319271B2 (en) * 2016-03-22 2019-06-11 Manufacturing Resources International, Inc. Cyclic redundancy check for electronic displays
US10756836B2 (en) 2016-05-31 2020-08-25 Manufacturing Resources International, Inc. Electronic display remote image verification system and method
US10313037B2 (en) 2016-05-31 2019-06-04 Manufacturing Resources International, Inc. Electronic display remote image verification system and method
US10510304B2 (en) 2016-08-10 2019-12-17 Manufacturing Resources International, Inc. Dynamic dimming LED backlight for LCD array
CN110192239A (zh) * 2017-01-24 2019-08-30 株式会社半导体能源研究所 显示装置及电子设备
US11895362B2 (en) 2021-10-29 2024-02-06 Manufacturing Resources International, Inc. Proof of play for images displayed at electronic displays
CN115394261A (zh) * 2022-08-25 2022-11-25 深圳市优奕视界有限公司 一种像素刷新存储方法、装置、电子设备及存储介质

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TW200949822A (en) 2009-12-01
JP2009175704A (ja) 2009-08-06

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